How do I remove Moire patterns from defishing?

[Selur]

With the H100, you should be able to use the torch-addon an ml tools, so scunet&basicvsr++ are an option.
You should make sure to use lossless formats as intermediate otherwise you end up compressing compression artifacts and creating new compression artifacts,..

(but I just tried Hybrid, and found it better, but the Bob is not working to double frame rates, and I have to increase to 60, to get 30fps. it's not automatically set correctly.)

Then you are doing something wrong.
Hybrid can bob deinterlaced fine (assuming it knows it should bob and that the source is interlaced).
Hybrid also can interpolate to different frame rates.

If it didn't zoom in, it would cause the border to be exposed at 100%, because of the shaking and Rock Steady smooth out, so all frames are fitted to size, position, angle, etc., to make it look nice, without reflections or black borders. Simple cropping doesn't work.

Normally, stabilization should add black borders all around, then once crops those borders and if needed/wanted resizes the result. The last resize should be skipped. So the idea is not to do a simple crop, but deshake and then crop. So if for stabilization you loose XY pixels at each side your resolution is lowered by that.

We really need to know what we are doing, and would be better if the GPU was used. Max Conversion rate is about 5-6fps.

Hybrid too has tons of encoders and filters which support using the gpu.

I also use HandBreak for deinterlacing SD,

Personally, I wouldn't use handbrake at all in this process.

Hybrid is best in serious problems, and the steepest learning curve by far.

Yes, Hybrid assumes that the user knows what he is doing.

Cu Selur

[7C Elements]

(but I just tried Hybrid, and found it better, but the Bob is not working to double frame rates, and I have to increase to 60, to get 30fps. it's not automatically set correctly.)

Then you are doing something wrong.
Hybrid can bob deinterlaced fine (assuming it knows it should bob and that the source is interlaced).
Hybrid also can interpolate to different frame rates.

I just tried it out for the first time, because converting an old MOV file to MP4, Handbreak did a mountain/forest set, and started meshing the trees badly. I tried many combinations, and finally had it come out perfect. The frame rate went to 15, or half, but I precompensated to 60, to fixed it, and came out better than HB.

[7C Elements]

Given the crappy (crf 28) source.
You will definitely lose some more 'details' since, even when looking at that manually, I often can't really tell what's artifact and what detail.
If possible, you might want to use 10bit encoding as intermediate to avoid some of the banding.

About filtering this mess:
a. try to find a mask i.e. LumaMask with Limit 100 (or higher) with which you can limit what you want to get filtered
b. then try some strong masked denoising
c. maybe downscale to 1080p and apply all filtering after that.

Cu Selur

Ps.: if machine learning is an option, downscaling to 1080p and applying SCUNet might be an option, to get it somewhat better, i.e. https://www.mediafire.com/file/ygh6h9wpy...y.mp4/file

I'm taking about the Moire artifact in the blue sky. Looking at the pixel level, it has a comb pattern on the sides, about a quarter of the frame. when the player window is scaled, it's a very noticeable, blocky Moire pattern, not quite Fraunhoffer lines. When the defishing is applied, the pixels are distorted within Mercalli to make the frame look normal. Something Mercalli is doing makes this pattern.

After I applied my filter pipeline, is smooths it out pretty good, most of the time, along with the degrain that I need.

I scaled using Hybrid's viewer to 2x, to test before and after, with each filter, until getting the cleanest result. 
I just tried the 10 bit, and the filter is very clean, and seems to have worked in one pass, but do I need all of those 4 filters now? I hope to speed it up.

I can't find what you mean, LumaMask, which filter.